Animalia: Animal Diversity II Key

Summary Table of Animal Characteristics

Roundworm:
- Symmetry: bilateral
- Tissue Organization: triploblastic
- Type of Body Cavity: pseudocoelom
- Digestive Openings: mouth, anus
- Circulatory System: none
- Habitat: various; Ascaris is parasitic
- Respiratory Organs: none (anaerobic)
- Excretory System: lateral lines
- Locomotion: crawl with muscle fibers
- Support System: hydrostatic skeleton
- Segmentation: no
- Appendages: none
- Nervous System Organization: dorsal and ventral nerve cords
Crayfish:
- Symmetry: bilateral
- Tissue Organization: triploblastic
- Type of Body Cavity: coelom (pericardium)
- Digestive Openings: mouth, anus
- Circulatory System: open: heart + arteries, no veins
- Habitat: aquatic
- Respiratory Organs: gills
- Excretory System: green glands
- Locomotion: 10 walking legs; swimmerets
- Support System: exoskeleton
- Segmentation: head, thorax, abdomen
- Appendages: 10 walking legs; swimmerets, 2 pairs antennae, telson, uropods
- Nervous System Organization: simple brain, ventral nerve cords
Grasshopper:
- Symmetry: bilateral
- Tissue Organization: triploblastic
- Type of Body Cavity: coelom (hemocoel)
- Digestive Openings: mouth, anus
- Circulatory System: open: heart + arteries
- Habitat: terrestrial
- Respiratory Organs: spiracles, tracheae
- Excretory System: Malpighian tubules
- Locomotion: 6 legs; 4 wings
- Support System: exoskeleton
- Segmentation: head, thorax, abdomen
- Appendages: 6 legs; 4 wings, antennae
- Nervous System Organization: simple brain, ventral nerve cord, segmental ganglia
Sea Star:
- Symmetry: bilateral larvae (radial adult)
- Tissue Organization: triploblastic
- Type of Body Cavity: coelom
- Digestive Openings: mouth, anus
- Circulatory System: water-vascular system operates hemal system
- Habitat: marine
- Respiratory Organs: skin gills (dermal branchiae)
- Excretory System: skin gills
- Locomotion: tube feet
- Support System: endoskeleton
- Segmentation: none
- Appendages: 5 arms
- Nervous System Organization: radial nerves, nerve ring
Lancelet (Amphioxus):
- Symmetry: bilateral
- Tissue Organization: triploblastic
- Type of Body Cavity: coelom
- Digestive Openings: mouth, anus
- Circulatory System: closed: arteries, capillaries, veins
- Habitat: marine
- Respiratory Organs: skin gills
- Excretory System: skin; gill slits mostly for feeding
- Locomotion: segmental muscles
- Support System: notochord
- Segmentation: muscles
- Appendages: tentacles, tail
- Nervous System Organization: dorsal nerve cord
Pig:
- Symmetry: bilateral
- Tissue Organization: triploblastic
- Type of Body Cavity: coelom
- Digestive Openings: mouth, anus
- Circulatory System: closed: cardiovascular: heart, arteries, veins
- Habitat: terrestrial
- Respiratory Organs: lungs, diaphragm
- Excretory System: kidney
- Locomotion: legs
- Support System: endoskeleton
- Segmentation: none (vertebrae are segments)
- Appendages: limbs, tail
- Nervous System Organization: brain, spinal cord - CNS; PNS